Thanks for the trouble shooting! It is as original to the gun as I can tell. The wood is quite depressed on the trigger guard channel. I added a couple of card board shims to see if it was bottoming out but the screw seemed to snug up just as it did without them. The stock does not shift side to side nor front to back and needs slight (gentle) force to remove it. It also retains the collar, but does have a quite a bit of space around the collar. I will shore that up first. I will also check the draws for play, they don't look worn or anything but I could be wrong. Would the length of the collar be a factor? It is shorter than the one in my No.4 MkI. Thanks again for your guidance, this rifle is one of my favorites in my collection.